Updating a drivecombobox

I'm using a drivecombobox on a form and would like to be able to update it by pressing a button.

When I say update, I mean that I mapped to a network drive while the program is already running, and would like my application to detect this new drive without me having to close and reopen the application.

If there is a way to detect the change and update without even having to associate it to a button... even better.

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